Officials promise to monitor situation after four-fold increase in size since February.
Aged 68, she has never seen a town - and refused a helicopter ride to hospital.
Unique physiology of people in Altai mountain region means only they can perform the melodies that date back centuries.
In distant times, parts of California and Hawaii were administered from the city of Irkutsk.
Agafya Lykova, 71, airlifted to hospital after suffering 'acute pains' in intense cold at her forest home more than 100 km from nearest town.
Flights late on Thursday and on Friday suffered disruption due to smog caused by blazes in dry woodland made vulnerable by the current heat wave.
Success for Liza Alert as snowmobile pair are tracked with help from people hundreds of kilometres away.
72 year old Agafya Lykova begged for help saying she was short of food.
The development is in an area of the world that claims to have one of the highest number of sightings of a legendary creature also known as Bigfoot.